The Daniel Defense Rail Interface System (RIS II) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program. It allows the individual operator to free-float the M203 grenade launcher without additional parts. Type Forend Finish Anodized Series RIS II Handguard Material 6061-T6 Aluminum Firearm Type Rifle Firearm Model AR Platforms Free Floating Yes